Perhaps you should try some spelling variations:
hanh trung » thanh trung, hanh trang, manh trung
hieu lang » chieu sang, hieu quang, nhieu tang
trung cua » truong cua, trung tuan, trung cap
hoc hieu » hoc thieu, hoc hien, doc hieu
cua dung » cua dang, cua dong, qua dung
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan ban » van ban

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu lang - hanh trung cua dung ((cong dan) or (cong san)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - hanh trung cua dung ((cong dan) OR (cong san)) toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - hanh trung cua dung ((cong dan) or (cong san)) toan ban*.